EP 1842190 A2 20071010 - OPTICAL SCANNING DEVICE
Title (en)
OPTICAL SCANNING DEVICE
Title (de)
OPTISCHE ABTASTVORRICHTUNG
Title (fr)
DISPOSITIF DE BALAYAGE OPTIQUE
Publication
Application
Priority
- IB 2006050190 W 20060118
- EP 05100288 A 20050119
- EP 06704571 A 20060118
Abstract (en)
[origin: WO2006077542A2] An optical scanning device for scanning optical record carriers, the optical record carriers including a first optical record carrier, a second optical record carrier and a third optical record carrier, the scanning device including a radiation source system (7) for producing first, second and third radiation beams for scanning said first, second and third record carriers, respectively, in first, second and third scanning modes, said first, second and third radiation beams having different predetermined wavelengths, the scanning device comprising an objective lens and an optical compensator, the optical compensator having a non-periodic phase structure through which each of said first, second and third radiation beams are arranged to pass, said non-periodic phase structure including a plurality of stepped annular zones separated by steps, the zones forming a non-periodic radial pattern, the stepped annular zones introducing first, second and third different wavefront modifications into at least part of the first, second and third radiation beams, respectively, characterized in that said objective lens is arranged to apply a focus offset when scanning said first record carrier, which focus offset is arranged to provide a phase modification which, in combination with said optical compensator, compensates spherical aberration in the first radiation beam.
IPC 8 full level
G11B 7/135 (2012.01); G11B 7/125 (2012.01)
CPC (source: EP KR US)
G11B 7/1275 (2013.01 - EP US); G11B 7/1367 (2013.01 - EP US); G11B 7/1374 (2013.01 - KR); G11B 7/13922 (2013.01 - EP US); G11B 2007/0006 (2013.01 - EP US)
Citation (search report)
See references of WO 2006077542A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006077542 A2 20060727; WO 2006077542 A3 20061005; CN 101107654 A 20080116; EP 1842190 A2 20071010; JP 2008527612 A 20080724; KR 20070105338 A 20071030; TW 200632895 A 20060916; US 2010046347 A1 20100225
DOCDB simple family (application)
IB 2006050190 W 20060118; CN 200680002724 A 20060118; EP 06704571 A 20060118; JP 2007551789 A 20060118; KR 20077018715 A 20070816; TW 95102060 A 20060119; US 81401206 A 20060118